No. It is a strong and standard principle of legal interpretation that you do not interpret one term in a contract or statute in a way that renders other provisions irrelevant.
The DVC terms contain provisions that explicitly contemplate fee-based rentals. If you re-interpret "commercial" to mean all third-party reservations for a rental fee, then those provisions regarding rental payments from third-party guests are rendered superfluous. Courts won't do that.
You cannot define "commercial" to mean making a profit. Commercial enterprises fail to make profits all the time. Under the "profit" definition, all failed businesses are non-commercial.
It also goes against standard use to isolate individual transactions. Non-profits routinely sell merchandise, and make profits on them which they use to subsidize their primary purpose. That does not disqualify them from being non-profits and render them commercial entities. Similarly, someone who uses their points mostly for personal use does not suddenly transform their membership into a "commercial purpose" with occasional rentals.
I have a serious photography hobby. I have spent thousands of dollars on it over the years. Very occasionally, someone contacts me to buy a print or license an image. On a net basis. I am nowhere near to making a profit. But I have to report every dollar anyone pays me on my taxes. And I definitely am not running a commercial photography business. Nobody would think that.
Nor does hiring a broker to facilitate the process make it commercial. Under this definition, everyone who sells their home using a broker is engaged in a commercial real estate business. Hiring an investment advisor does not make me a professional investor. Hiring a
travel agent does not render one's trip to Disney a commercial venture. People hire professionals to assist in their private non-commercial activities all the time., but that does not transform the activity into being commercial.
Yes, there is some flexibility in interpreting "commercial purpose," but pretty much any attempt to cast the net as wide as people are trying to do in this thread is never going to succeed.